Heater



FIG. 1 is a top, front, and right side perspective view of a heatershowing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is an enlarged top plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is an enlarged bottom plan view thereof;

FIG. 6 is a rear elevational view thereof; and,

FIG. 7 is a top, rear, and right side perspective view thereof.

The broken-line disclosure in the views is for illustrative purposesonly and forms no part of the claimed design.

The ornamental design for a heater, as shown and described.